biginteger - Big numbers library in c++

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Answer 1

The GNU Multiple Precision Arithmetic Library does what you want http://gmplib.org/

Gnu MP is a C library but it has a C++ class Interface and if you are interested only in big integers, you may just deal with mpz_class. Look at the sample below which I took from the page C++ Interface General

 int main (void)
 {
   mpz_class a, b, c;

   a = 1234;
   b = "-5678";
   c = a+b;
   cout << "sum is " << c << "
";
   cout << "absolute value is " << abs(c) << "
";

   return 0;
 }